Since 1977, Don Herron has been leading The Dashiell Hammett Tour, a San Francisco walking tour of notable locations from the hard-boiled detective novels of author Dashiell Hammett. Among the stops on the tour: 891 Post Street, where Hammett lived and wrote in the 1920s, and Burritt Street, where Sam Spade’s partner is murdered in The Maltese Falcon. A recent New York Times article took a closer look at San Francisco’s noir heritage and The Dashiell Hammett Tour.